Nut-lock.



E. A. 'HEMSTEGER.

NUT LOOK.

APPLICATION FILED JUNE 25, 1908.

901,810. I v Patented Oct. 20, 1908.

EDWARD A. HEMSTEGER, OF CHICAGO, ILLINOIS.

NUT-LOCK.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed June 25, 1908. Serial No. 440,375.

To all whom it may concern:

Be it known that I, EDWARD A. HEM- s'rEenR, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Nut-Locks, of

which the following is a specification.

This invention consists of a nut lock the principle of operation ofwhich is similar to that shown and described by the United States PatentNo. 527,569, dated October 16, 1894:.

The object of the invention is to provide a device of the above classwhich is extremely simple in construction and therefore cheap tomanufacture, and in which the locking principle of the nut locking meansin the patent above referred to is carried out in a more practicaldevice and one which more fully answers commercial purposes.

For a full understanding of the inven tion, reference is to be had tothe following detail description and to the accompanying drawings, inwhich Figure 1 is a vertical longitudinal sectional View showing theinvention applied; Fig. 2 is a transverse section of the nut lockingmember bringing out more clearly the sectional formation of the bolt andnut engaging flange; Fig. 3 is a detail perspective view of the nutlocking member.

Throughout the following detail description and on the several figuresof the drawings similar parts are referred to by like referencecharacters.

It is contemplated in the practical embodiment of the present inventionto employ a special form of nut in conjunction with a peculiar lockingmember for preventing displacement thereof from the bolt. In thedrawings the numeral 1 designates the bolt which is provided with theusual threaded end upon which the nut 2 is adapted to screw in thecustomary manner. The nut 2 is provided with the usual threaded opening,the latter, however, bein enlarged, flared, or formed with a cham er 2at its outer -end. This chamfer 2 is a necessary and important elementof the construction of the nut, as will appear more clearly hereinafter.

To prevent displacement of the nut 2 a locking member 3 is employed andthe latter preferably consists of a plate of many sided form, and of athickness suitable for the purpose desired, said plate 3 being providedwith a bolt receiving opening 4. At the opening 4 in the locking member3 the latter is formed with a locking flange 5 of peculiar formation.This flange 5 is integral with the member 3 and is of spiralformation-at the same time projecting outwardly from one side of thelocking member. The locking flange 5 is so formed that it is readilyadapted to engage the threads of the bolt 1 and by turning the lockingmember the latter may be caused to move longitudinally of the bolt in amanner similar to the adjustment of the nut. The flange 5 is ofsomewhattriangular formation in cross section and its innermost portionforms a spiral cutting or biting edge, while its outer edge inclinesoutwardly. At its outermost end the flange 5 ends abruptly and at thepoint of its beginning its outer surface is smooth and performs thefunctions of a cam in cooperation with the nut 2. In other words theflange gradually increases in size in cross section from its point ofbeginning to the abrupt end thereof, and its larger portion is adaptedto give under tension to subserve the jamming or looking effect of thedevice in action.

Describing the operation of the invention, the nut 2 having been screwedupon the bolt 1 in the customary way, the locking member 3 is disposedupon the bolt and screwed toward the outer ,side of the nut. As thelocking member approaches the nut in the adjustment above referred tothe flange 5 enters the triangular space between the chamfer portion 2of the nut and the bolt, and the spiral format-ion of the flange causesthe latter to act as a cam when the member 3 is rotated, the outersurface of the flange operating in contact with the chamfer 2 while theinner edge of the flange is caused to bite into the threaded portion ofthe bolt 1. The frictional engagement of the outer surface of the flange5 with the chamfer 2 of the nut 2 and the biting action of the inneredge of the flange against the threaded portion of the bolt 1 areeffective in securing the nut from displacement.

The present invention embodies in a single integral structure thelocking principle of the device of the patent above referred to and doesnot necessitate the use of any special tool or operating member in theactual opera tion thereof.

It will be apparent that the nut locking member 3 may be readily removedwhenever desired, that a toolmay be readily applied to the member directin placing the same in operative position, and that the member 3 may bemade in different sizes and of different forms so that it embodies thespecial features of construction which have been before described assuitable and essential features of the present invention.

Having thus described the invention, what is claimed as new, is: I

As a new article of manufacture, a nut lock consisting of a plateprovided with an opening adapted to receive a bolt, said plate having aspiral thread engaging flange of triangular cross section prO ectingoutwardly from a side thereof and substantially concentric withreference to the bolt opening aforesaid, the flange increasing in sizefrom its point of beginnmg to an abrupt terminal point substantially atsaid point of beginning and at the same time inclining outwardly fromits point of beginning to its abrupt extremity above mentioned.

In testimony whereof I aflix my signature in presence of two witnesses.

EDWARD A. HEMSTEGER. Witnesses:

W. VETTER, C. S. E ERETT.

